Access the internal maintenance mode by pressing the Menu/Set button, then press * 2 8 6 4 within 2 seconds. This should put you in the maintenance mode menu. Enter 80, then scroll down with the arrow down (round) key. You'll find an entry listed as purge count. If number is over 6000, enter 2 7 8 3.

This will reset the purge count value. Then the printer will restart, hopefully without the annoying cannot clean message.All I ask is please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

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The 4F error is related to a failed printhead.
In the case of this new printer coming up with a 4F error it can be one of two things.
1) The printer had a faulty printhead straight out of box. Not common but can happen.
2) You have pushed your printer too hard. Normally Brother Inkjet printers are not designed to handle 2000 page print jobs (That is 4 reams of paper) most inkjet printers don't even have close to enough ink to do this sort of print job. You may have just blown the printhead up through overuse.

Access the internal maintenance mode by pressing the Menu/Set button, then press * 2 8 6 4 within 2 seconds. This should put you in the maintenance mode menu. Enter 80, then scroll down with the arrow down (round) key. You'll find an entry listed as purge count. If number is over 6000, enter 2 7 8 3.

This will reset the purge count value. Then the printer will restart, hopefully without the annoying cannot clean message.All I ask is please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

Access the internal maintenance mode by pressing the Menu/Set button, then press * 2 8 6 4 within 2 seconds.
This should put you in the maintenance mode menu.
Enter 80, then scroll down with the arrow down (round) key.
You'll find an entry listed as purge count.
If number is over 6000, enter 2 7 8 3.

The code 4F unable to clean comes up for paper jam, if no paper jam,TRY THIS MENU * 2864 VERY QUICKLY TAKES YOU TO MAINTANENCE MODE, ALL LIGHS FLASH... PRESS 82 SET, YOUR ERROR CODE WILL DISPLAY. THAT IS NEXT STEP.!!!!